A195726 Decimal expansion of arccos(-sqrt(5/6)).
2, 7, 2, 1, 0, 5, 8, 3, 1, 8, 3, 0, 5, 8, 2, 8, 1, 1, 0, 5, 7, 4, 3, 8, 0, 8, 6, 7, 3, 6, 6, 2, 8, 7, 5, 1, 0, 8, 4, 6, 1, 3, 0, 0, 0, 6, 5, 5, 5, 1, 8, 6, 2, 1, 1, 0, 8, 5, 6, 8, 3, 1, 8, 9, 9, 6, 1, 7, 7, 1, 7, 5, 4, 5, 4, 8, 0, 4, 0, 3, 1, 8, 3, 6, 8, 7, 6, 7, 8, 2, 2, 9, 1, 6, 3, 2, 4, 5, 5, 1
Offset: 1
Examples
arccos(-sqrt(5/6)) = 2.72105831830582...
Links
Crossrefs
Cf. A195725.
Programs
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Magma
SetDefaultRealField(RealField(100)); Arccos(-Sqrt(5/6)); // G. C. Greubel, Aug 20 2018
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Mathematica
r = Sqrt[5/6]; N[ArcCos[-r], 100] RealDigits[%]
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PARI
acos(-sqrt(5/6)) \\ G. C. Greubel, Aug 20 2018
Formula
Equals Pi - arcsin(sqrt(1/6)) = Pi - arctan(sqrt(1/5)). - Amiram Eldar, Jul 10 2023